Circular motion
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6 Terms
1
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define a radian
The angle subtended at the centre of a circle by an arc equal in length to the radius.
2
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define angular displacement
the change in angle in radians of a body as it rotates around a circle
3
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define angular speed
rate of change in angular displacement with respect to time
4
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unit for angular speed
rad s-1
5
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describe velocity and acceleration of a body travelling in uniform circular motion
velocity is constantly changing because it is constantly changing direction so therefore it is accelerating
6
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define centripetal force
resultant force towards the centre of the circle required to keep a body in uniform circular motion. it is always directed towards the centre of the body's rotation
Note 
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